diff --git a/include/dis-asm.h b/include/dis-asm.h
index f1a83dc84e5..4921c040710 100644
--- a/include/dis-asm.h
+++ b/include/dis-asm.h
@@ -318,7 +318,8 @@ typedef struct
   /* Option argument name to use in descriptions.  */
   const char *name;
 
-  /* Vector of acceptable option argument values, NULL-terminated.  */
+  /* Vector of acceptable option argument values, NULL-terminated.
+     NULL if any values are accepted.  */
   const char **values;
 } disasm_option_arg_t;
 
diff --git a/opcodes/arc-dis.c b/opcodes/arc-dis.c
index 3490bad4f66..c8dc525f64d 100644
--- a/opcodes/arc-dis.c
+++ b/opcodes/arc-dis.c
@@ -1611,6 +1611,8 @@ print_arc_disassembler_options (FILE *stream)
   for (i = 0; args[i].name != NULL; ++i)
     {
       size_t len = 3;
+      if (args[i].values == NULL)
+	continue;
       fprintf (stream, _("\n\
   For the options above, the following values are supported for \"%s\":\n   "),
 	       args[i].name);
diff --git a/opcodes/mips-dis.c b/opcodes/mips-dis.c
index 9db604ffb39..faeebccfc3b 100644
--- a/opcodes/mips-dis.c
+++ b/opcodes/mips-dis.c
@@ -2809,6 +2809,8 @@ with the -M switch (multiple options should be separated by commas):\n\n"));
 
   for (i = 0; args[i].name != NULL; i++)
     {
+      if (args[i].values == NULL)
+	continue;
       fprintf (stream, _("\n\
   For the options above, the following values are supported for \"%s\":\n   "),
 	       args[i].name);
diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c
index 160cc40f865..7ae6e709290 100644
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -1195,6 +1195,8 @@ with the -M switch (multiple options should be separated by commas):\n"));
 
   for (i = 0; args[i].name != NULL; i++)
     {
+      if (args[i].values == NULL)
+	continue;
       fprintf (stream, _("\n\
   For the options above, the following values are supported for \"%s\":\n   "),
 	       args[i].name);